blob: 63522072dda6257f350045581625a96cef60010f [file] [log] [blame]
/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "src/gpu/ganesh/effects/GrShadowGeoProc.h"
#include "include/core/SkSamplingOptions.h"
#include "include/private/base/SkAssert.h"
#include "include/private/gpu/ganesh/GrTypesPriv.h"
#include "src/core/SkSLTypeShared.h"
#include "src/gpu/ganesh/GrSamplerState.h"
#include "src/gpu/ganesh/GrSurfaceProxy.h"
#include "src/gpu/ganesh/GrSurfaceProxyView.h"
#include "src/gpu/ganesh/glsl/GrGLSLFragmentShaderBuilder.h"
#include "src/gpu/ganesh/glsl/GrGLSLVarying.h"
class GrGLSLProgramDataManager;
class GrGLSLVertexBuilder;
struct GrShaderCaps;
class GrRRectShadowGeoProc::Impl : public ProgramImpl {
public:
void setData(const GrGLSLProgramDataManager&,
const GrShaderCaps&,
const GrGeometryProcessor&) override {}
private:
void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
const GrRRectShadowGeoProc& rsgp = args.fGeomProc.cast<GrRRectShadowGeoProc>();
GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder;
GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler;
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
// emit attributes
varyingHandler->emitAttributes(rsgp);
fragBuilder->codeAppend("half3 shadowParams;");
varyingHandler->addPassThroughAttribute(rsgp.inShadowParams().asShaderVar(),
"shadowParams");
// setup pass through color
fragBuilder->codeAppendf("half4 %s;", args.fOutputColor);
varyingHandler->addPassThroughAttribute(rsgp.inColor().asShaderVar(), args.fOutputColor);
// Setup position
WriteOutputPosition(vertBuilder, gpArgs, rsgp.inPosition().name());
// No need for local coordinates, this GP does not combine with fragment processors
fragBuilder->codeAppend("half d = length(shadowParams.xy);");
fragBuilder->codeAppend("float2 uv = float2(shadowParams.z * (1.0 - d), 0.5);");
fragBuilder->codeAppend("half factor = ");
fragBuilder->appendTextureLookup(args.fTexSamplers[0], "uv");
fragBuilder->codeAppend(".a;");
fragBuilder->codeAppendf("half4 %s = half4(factor);", args.fOutputCoverage);
}
};
///////////////////////////////////////////////////////////////////////////////
GrRRectShadowGeoProc::GrRRectShadowGeoProc(const GrSurfaceProxyView& lutView)
: INHERITED(kGrRRectShadowGeoProc_ClassID) {
fInPosition = {"inPosition", kFloat2_GrVertexAttribType, SkSLType::kFloat2};
fInColor = {"inColor", kUByte4_norm_GrVertexAttribType, SkSLType::kHalf4};
fInShadowParams = {"inShadowParams", kFloat3_GrVertexAttribType, SkSLType::kHalf3};
this->setVertexAttributesWithImplicitOffsets(&fInPosition, 3);
SkASSERT(lutView.proxy());
fLUTTextureSampler.reset(GrSamplerState::Filter::kLinear, lutView.proxy()->backendFormat(),
lutView.swizzle());
this->setTextureSamplerCnt(1);
}
std::unique_ptr<GrGeometryProcessor::ProgramImpl> GrRRectShadowGeoProc::makeProgramImpl(
const GrShaderCaps&) const {
return std::make_unique<Impl>();
}
///////////////////////////////////////////////////////////////////////////////
GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrRRectShadowGeoProc)
#if defined(GR_TEST_UTILS)
GrGeometryProcessor* GrRRectShadowGeoProc::TestCreate(GrProcessorTestData* d) {
auto [view, ct, at] = d->randomAlphaOnlyView();
return GrRRectShadowGeoProc::Make(d->allocator(), view);
}
#endif